LOCATION TUMBLE                  OR

Tentative Series
IRD. DCR/KMS
02/2025

TUMBLE SERIES

Landscape--western Cascade Mountains
Landform--cirque headwalls, cirque floors, colluvial aprons
Slope--2 to 70 percent
Parent material--colluvium derived from volcanic rocks mixed with volcanic ash
Mean annual precipitation--about 2150 mm
Mean annual air temperature--about 5 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Medial-skeletal, amorphic Pachic Fulvicryands

TYPICAL PEDON: Tumble medial loam on a north-facing, 50-percent slope at an elevation of 1305 m, under deciduous shrubs (When described on June 24, 2015, the soil was dry from the surface to a depth of 2 cm, slightly moist from a depth of 2 to 35 cm, and moist from a depth of 35 to 150 cm.)

Oi--0 to 2 cm; slightly decomposed plant material; abrupt wavy boundary

A1--2 to 10 cm; medial loam, very dark grayish brown (10YR 3/2) dry, black (10YR 2/1) moist; moderate fine granular structure; soft, very friable, nonsticky and nonplastic; many medium and common very fine, fine, coarse, and very coarse roots; many fine interstitial pores; 5 percent krotovinas; 3 percent gravel, 1 percent cobbles, and 1 percent stones; very strongly acid (pH 4.8); clear wavy boundary

A2--10 to 35 cm; gravelly medial loam, dark brown (10YR 3/3) dry, very dark brown (7.5YR 2.5/2) moist; moderate fine granular structure; soft, very friable, nonsticky and nonplastic; many medium and common very fine, fine, coarse, and very coarse roots; many fine interstitial pores; 5 percent krotovinas; 15 percent gravel, 3 percent cobbles, and 2 percent stones; very strongly acid (pH 5.0); clear wavy boundary

AB--35 to 70 cm; very stony medial loam, brown (10YR 4/3) dry, dark brown (7.5YR 3/2) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common medium, coarse, and very fine and few fine roots; many very fine dendritic tubular pores; 10 percent gravel, 15 percent cobbles, and 15 percent stones; very strongly acid (pH 5.0); clear wavy boundary

Bw--70 to 150 cm; very stony medial loam, brown (10YR 5/3) dry, dark brown (7.5YR 3/3) moist; weak fine subangular blocky structure; slightly hard, friable, nonsticky, nonplastic; common medium, coarse, and very fine and few fine roots; common very fine dendritic tubular pores; 10 percent gravel, 15 percent cobbles, and 25 percent stones; strongly acid (pH 5.2)

TYPE LOCATION: Marion County, Oregon, about 6 km north of Detroit Dam, in Willamette National Forest; about 330 m north and 50 m west of the southeast corner of section 19, T. 9 S., R. 5 E.; latitude 44.77356, longitude -122.23580, datum WGS 84 (coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Dry days--less than 45 consecutive days following summer solstice
Mean annual soil temperature--5 to 8 degrees C
Thickness of umbric epipedon--50 to 150 cm
Melanic index--greater than 1.7

Estimated properties of layers with andic soil properties
*1/3-bar bulk density--0.45 to 0.9 g/cm3
*Ammonium oxalate extractable Al plus 1/2 Fe--2 to 6 percent
*Phosphate retention--greater than 85 percent
*15-bar water retention--30 to 70 percent (undried samples), greater than 15 percent (dried samples)
*Particles 0.02- to 2.0-mm diameter--greater than 30 percent of the fine-earth fraction
*Volcanic glass content in 0.02- to 2.0-mm fraction--5 to 30 percent

Particle-size control section (weighted average)
*Clay content--10 to 18 percent
*Total rock fragment content--35 to 60 percent

O horizon
*Composition-slightly to moderately decomposed plant material
*Thickness--0 to 10 cm

A horizons
*Hue--10YR, 7.5YR
*Value--2 to 3 moist, 3 or 4 dry
*Chroma--1 or 2 moist, 2 or 3 dry
*Fine-earth texture--medial loam, medial silt loam
*Clay content--10 to 18 percent
*Total fragment content--0 to 35 percent
*Gravel content--0 to 35 percent
*Cobble content--0 to 15 percent
*Stone content--0 to 10 percent
*Boulder content--0 to 5 percent
*Organic carbon content--6 to 12 percent
*Reaction--pH 4.5 to 6.0
*Thickness--25 to 50 cm

AB horizon
*Hue--7.5YR, 10YR
*Value--3 moist, 4 or 5 dry
*Chroma--2 to 3 moist or dry
*Fine-earth texture--medial loam, medial silt loam
*Clay content--10 to 18 percent
*Total fragment content--35 to 70 percent
*Gravel content--10 to 50 percent
*Cobble content--5 to 35 percent
*Stone content--0 to 30 percent
*Boulder content--0 to 5 percent
*Organic carbon content--3 to 9 percent
*Reaction--pH 4.5 to 6.0
*Thickness--25 to 50 cm

Bw horizon
*Hue--7.5YR, 10YR
*Value--3 or 4 moist, 4 or 5 dry
*Chroma--2 to 3 moist or dry
*Fine-earth texture--medial loam, medial silt loam
*Clay content--10 to 18 percent
*Total fragment content--35 to 70 percent
*Gravel content--10 to 50 percent
*Cobble content--5 to 35 percent
*Stone content--0 to 30 percent
*Boulder content--0 to 5 percent
*Organic carbon content--1 to 4 percent
*Reaction--pH 5.1 to 6.0

COMPETING SERIES:
Stetattle--particle-size control section averages less than 10 percent clay; 30 to 60 percent volcanic glass in upper part

GEOGRAPHIC SETTING:
Elevation--980 to 1700 m
Aspect--generally north facing
Climate--cold wet winters; mild, dry summers
Mean annual precipitation--2300 to 2900 mm
Mean annual air temperature--4 to 7 degrees C
Frost-free period--60 to 105 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Chucksney--averages less than 35 percent rock fragments in the particle-size control section; located on south-facing glacial-valley walls and mountaintops
Kinzel--umbric epipedon is 25 to 45 cm thick; located on colluvial aprons and cirque floors
Thader--50 to 100 cm deep to lithic contact; located on north-facing cirque headwalls and scoured positions on cirque floors

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation during normal years--none within profile
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high

USE AND VEGETATION:
Use--wildlife habitat, watershed management
Potential natural vegetation--deciduous shrubfields composed of Sitka alder, salmonberry, western mountain ash, red elderberry, Pacific bleeding heart, youth on age, white avalanche-lily, starry false lily of the valley, redwood-sorrel

DISTRIBUTION AND EXTENT: Western Cascade Mountains, Oregon; MLRA 3; small extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana

SERIES PROPOSED: Willamette National Forest, Marion County, Oregon; 2015; name from Tumble Lake, near the type location

REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 2 to 102 cm
*Umbric epipedon--zone from 2 to 150 cm
*Cambic horizon--zone from 70 to 150 cm
*Andic soil properties--zone from 2 to 150 cm
*Volcanic glass--zone from 2 to 150 cm

1/2023--all mineral horizons meet criteria #2 (no ash required) and #3 for andic soil properties in the 13th edition of Keys to Soil Taxonomy.

ADDITIONAL DATA:
Typical user pedon ID--2015OR047793

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National Cooperative Soil Survey
U.S.A.